✅ MADE IN THE USA

✅ 2-YEAR WARRANTY 

✅ FREE U.S. SHIPPING

✅ SINCE 1931 – THE PIONEER IN METAL DETECTING

Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher CZ-21 Metal Detector with an 8-inch waterproof searchcoil, submersible up to 250 feet, dual-frequency operation, target ID, and adjustable ground balance, ideal for underwater and beach treasure hunting.
Fisher: Since 1931

Fisher CZ21 Underwater Multi-Frequency Metal Detector

$1,799.00 USD
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Product Description

The Fisher CZ21 is a professional-grade metal detector built for serious treasure hunters who demand performance in both land and underwater environments. Ideal for beachcombers, divers, and relic seekers, it stands out for its fully submersible design rated for depths up to 250 feet, making it a true amphibious powerhouse.


Engineered with Fisher’s dual-frequency VLF technology, the CZ21 delivers superior depth and target separation in saltwater, freshwater, or mineralized soil. It features precise target ID, adjustable discrimination, and multi-tone audio to distinguish between trash and valuables. The large waterproof searchcoil enhances detection coverage, while manual ground balance and pinpoint mode offer refined control and accuracy in any terrain.


Built to withstand harsh environments, the CZ21 features a rugged, corrosion-resistant housing and a comfortable, ergonomic design. Its adjustable shaft and padded armrest provide stability during extended hunts, and the simple analog controls make operation intuitive. Powered by standard batteries with long runtime, this detector is dependable for full-day excursions in even the most challenging conditions.


Purpose: Deep Diving, Relic Hunting, Coin Shooting, Beach Hunting, Jewelry,

Specifications

  • Manufacturer: First Texas Products, LLC
  • Brand Name: Fisher Research Labs
  • Country of Origin: USA
  • Warranty: 2 Years
  • Technology: VLF
  • Frequency: Dual Frequency - 5 kHz & 15 kHz
  • Operating Modes: 3 (Target-ID | Auto-Tune | Pinpoint)
  • Ground Balance: Manual
  • Discrimination: Yes
  • Target ID: No
  • Numeric ID: No
  • Fe Readout: No
  • Fe-Tone Audio: No
  • Audio: Yes, 3-Tone Audio Feedback (|Low | Medium | High)
  • Volume: Yes, 10-Level Adjustment
  • Sensitivity: Yes, 10-Level Adjustment
  • Depth Indicator: No
  • Pinpoint: Yes
  • Memory: No
  • Backlight: No
  • Display: Analog
  • Weatherproof: Yes (fully submersible to 250 ft)
  • IP Rating: IP54
  • Stock Searchcoil(s): 8" or 10"
  • Headphone Jack: No (Includes permanently attached waterproof headphones)
  • Weight: 5 lbs. 11 oz. (2.6 kg)
  • Battery Type: 4 x 9V (Not Included)
  • Battery Life: 35-5 Hours (Alkaline Recommended)

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    Parts & Accesories

    Manual

    CZ21

    Support

    For more information and to purchase, visit where to buy , email us , chat with us, or call us at 1-800-685-5050   for any questions.
    For repair service in warranty or out of warranty please fill out the RMA form.

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    Frequently Asked Questions

    Can I use the CZ21 in brackish water, and how will it affect performance?

    Yes, the CZ21 can be used in brackish water, but the mix of fresh and saltwater may cause inconsistent ground balancing. Adjust sensitivity settings lower than in pure saltwater to reduce instability. Testing different ground balance settings while in the water will help optimize performance.

    Yes, the CZ21 can be used in brackish water, but the mix of fresh and saltwater may cause inconsistent ground balancing. Adjust sensitivity settings lower than in pure saltwater to reduce instability. Testing different ground balance settings while in the water will help optimize performance.

    The sudden change in ground conductivity between dry and wet sand can cause the detector to misinterpret signals. To minimize this, ground balance in the wet sand first before transitioning between the two terrains.

    Can the CZ21 detect thin gold chains or small gold nuggets effectively?

    The CZ21 is optimized for larger gold objects and has difficulty detecting thin gold chains or small nuggets. Using the Auto-Tune mode at high sensitivity may improve detection, but for very fine gold, a higher-frequency gold-specific detector would be more effective.

    How does extreme cold (below 32°F) affect CZ21 performance?

    Cold temperatures can reduce battery efficiency, leading to shorter operational times. Additionally, LCD displays may respond slower, and the rubber seals around the battery compartment can become less flexible, increasing the risk of leaks. Using lithium batteries instead of alkalines can help in cold conditions.

    What are the best coil sweeping techniques to maximize depth detection underwater?

    Use slow, deliberate sweeps with a slight overlap, keeping the coil as parallel to the bottom as possible. Quick or erratic movements can introduce turbulence, causing false signals. Additionally, reducing sensitivity slightly can help mitigate interference from saltwater conductivity.

    Why does my detector overload when scanning large targets, and how can I still identify them?

    Large metal objects close to the surface can cause signal saturation, leading to a bell-tone overload warning. To identify the target, raise the coil several inches above the ground and sweep again—this will reduce the signal strength, allowing for proper identification.

    Can I modify the headphone connection to use third-party waterproof headphones?

    No, the CZ-21’s headphones are permanently attached and cannot be swapped without factory modifications. Attempting to alter the connection will void the warranty and may lead to water leakage issues.

    What is the best way to clean the detector after saltwater use to prevent long-term damage?

    Rinse the detector with fresh water immediately after use, focusing on the coil, control panel, and headphone connections. Let it dry completely before storing. Avoid using petroleum-based lubricants on seals; instead, clean them with mild soap and warm water to maintain waterproof integrity.

    Why does my hip-mounted control box sometimes cause false signals?

    The search coil can detect the control box if it's too close to your waist, especially at the end of a sweep. To prevent this, leave a slight slack in the cable, mount the control box on your non-swinging side, and ensure the coil does not pass directly under the control housing.
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    Landon Howlett
    "...he found his first coin. A 1946 wheat. I'm glad to say we have a new Digger in the family."
    - Fisher F70
    JimDoan
    Jim Doan
    This is a Union Officers belt plate from the Civil War, it was found at a G.A.R. 1895 Civil War reunion encampment...
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    RyanVecchio1
    Ryan Vecchio
    "...great detector please keep me informed on the new machines coming out I got pictures of your detectors for years finding things in fields that have been hunted by everything till the first Texas hit the ground." 
    - Bounty Hunter Platinum
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    James K.
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